Conveyor system

ABSTRACT

A conveyor system has a pair of outer wheel tracks and a pair of inner wheel tracks, the wheel tracks of each pair being spaced from each other and extending parallel to each other. Each wheel track has at least one generally vertical portion and at least one generally horizontal portion. A conveyor member has two pairs of wheels, the wheels of each pair being located on opposite sides of the member, each pair of wheels engaging one pair of wheel tracks; The wheels and tracks are configured and oriented relative to each other so that the member is maintained in a selected orientation as the member moves relative to and along the tracks.

This application claims the benefit of U.S. Provisional Application No.60/812,535 filed 9 Jun. 2006, titled “CONVEYOR SYSTEM.”

BACKGROUND

1. Technical Field

The technical field is conveyor systems.

2. Description of the Prior Art

Conveyor systems are used to move objects from one station to another.The stations may be located at the termination points at the beginningand end of the system or may be located at points between thetermination points. Conveyor systems have any number of stations, andthe systems may be configured to deliver objects to some or all of thestations during operation of the systems.

A typical conveyor system has a conveyor member, which may be, forexample, a belt, tray, or box. Objects to be moved are placed in or onthe conveyor member, which is propelled by a drive system, such as anelectric drive system. The drive system is connected to the conveyormember directly or by means of at least one torque transfer device, suchas a tape, a belt, a chain, or a set of gears.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic side view of a conveyor system.

FIG. 2 is a schematic end view of the system of FIG. 1.

FIG. 3 is an oblique view of a portion of another embodiment of aconveyor system.

FIG. 4 is a schematic cross-sectional end view of a portion of anotherembodiment of a conveyor system.

FIG. 5 is a schematic side view of a portion of the system of FIG. 4.

FIG. 6 is a schematic side view of a portion of another embodiment of aconveyor system.

FIG. 7 is a top view of a portion of another embodiment of a conveyorsystem.

FIG. 8 is an end view of a portion of the conveyor system of FIG. 7.

FIG. 9 is a schematic top view of a portion of another embodiment of aconveyor system.

FIG. 10 is a schematic side view of a portion of the conveyor system ofFIG. 9.

FIG. 11 is a series of schematic end views of the conveyor system ofFIG. 10.

FIG. 12 is a series of schematic end views of the conveyor system ofFIG. 10.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A reversible, multi-plane conveyor system has a wheeled conveyor member,such as a box or platform, propelled by at least one tape along wheeltracks. The conveyor member can travel horizontally and vertically andcan be configured to provide curved paths. The system is preferablypowered by at least one motor. In a preferred embodiment, the conveyormember travels between two end points and may be stopped at intermediatelocations along the travel path. The system design also contemplates theuse of multiple stations, similar to a dumbwaiter providing serviceemanating from a base station to one or several substations. Thestations can be arranged on one floor or multiple floors.

FIGS. 1 and 2 show a conveyor system 11 having a transport box 13, apair of outer wheel tracks 15, and a pair of inner wheel tracks 17. Box13 acts as the conveyor member and may be a box having vertical sides,as shown, or may be configured to have other shapes, such as a tray. Box13 has a pair of upper wheels 19 and a pair of lower wheels 21, thewheels of each pair being located on opposite sides of box 13. In theembodiment shown, upper wheels 19 are located above and behind lowerwheels 21, which are located on a lower portion near the front of box13. Upper wheels 19 are configured for engaging outer tracks 15, andlower wheels 21 are configured for engaging inner tracks 17, wheels 19,21 rolling within the corresponding tracks 15, 17 and guided along atravel path.

Each outer track 15 comprises a first vertical portion 15 a, ahorizontal portion 15 b, and a second vertical portion 15 c. Likewise,inner track 17 comprises a first vertical portion 17 a, a horizontalportion 17 b, and a second vertical portion 17 c. Tracks 15, 17preferably have a “C”-shaped cross-section, such as the tracks commonlyused for overhead doors, for retaining and guiding wheels 19, 21 withintheir respective track 15, 17. In the embodiment shown, tracks 15, 17are configured and oriented such that portions 17 a are laterally spacedahead of portions 15 a, portions 17 b are spaced below portions 15 b,and portions 17 c are spaced ahead of portions 15 c. This relativeorientation ensures that box 13 maintains a selected angular orientationabout horizontal axes as box 13 is guided along the travel path.

Each of a pair of continuous loops of conveyor tape 23 is arranged in atape path that generally coincides with the travel path of box 13 as box13 moves from one end of tracks 15, 17 to the other end of tracks 15,17. The tape path is defined by a motor pulley 25 a, a plurality ofintermediate pulleys 25 b (only some are labeled), and a return pulley25 c. Tape 23 is propelled along the travel path by motor 27, whichturns motor pulley 25 a. Tape 23 is connected to box 13 at connectors 29a, 29 b, such that box 13 is propelled along the travel path when motor27 is operated. Tape 23 may be a solid or perforated tape or belt or maybe any other appropriate type for use with box 13.

In operation, items are placed within box 13 at one end station, andthen motor 27 is operated to rotate motor pulley 25 a in a onedirection. This moves each tape 23 along its tape path, which moves box13 along its travel path toward the other end station. Wheels 19, 21roll within the corresponding wheel tracks 15, 17, guiding box 13 andmaintaining box 13 in a selected angular orientation about horizontalaxes passing through box 13. Box 13 is then sent back to the originalend station by reversing the direction or rotation of motor pulley 25 a.It should be noted that the travel path of box 13 can be extended at theend of wheel tracks 15, 17 to provide for additional horizontal travel.

FIG. 3 shows a portion of another embodiment of a conveyor system 31,which is constructed in a similar configuration as conveyor system 11.System 31 is configured to move box 33 between a position withinbuilding 35, across elevated horizontal portion 37, and down withinvertical portion 39 to an end station. While box 33 travels along thetravel path, system 31 maintains box 33 in a selected angularorientation about horizontal axes using components similar to thosedescribed above. As shown, system 31 may be used, for example, to moveitems to and from customers in a “drive-through” lane of a bank,restaurant, or similar establishment.

FIGS. 4 and 5 show portions of another embodiment of a conveyor system.FIG. 4 is a schematic cross-sectional end view of a portion of thesystem, and FIG. 5 is a schematic side view of a portion of the system.System 41 comprises a transport box 43, a pair of outer wheel tracks 45,and a pair of inner wheel tracks 47. Tracks 45, 47 are constructedsimilarly to tracks 15, 17 described above. Only one side of system 41is shown in the view, so only one outer track 45 and one inner track 47are visible. The view shows one of a pair of upper wheels 49 engagingone of outer tracks 45 and shows one of a pair of lower wheels 51engaging one of inner tracks 47. Outer track 45 is directly attached toa sidewall 53 of system 41, and inner track 47 is attached to sidewall53 with a bracket 55, which secures inner track 47 in a desired positionand spaces inner track 47 from sidewall 53. Each upper wheel 49 isrotatably attached to box 43 with an axle 57, and each lower wheel 51 isrotatably attached to box 43 with an axle 59.

In the embodiment of FIGS. 4 and 5, box 43 is propelled using a tape 61that engages a rotatable sleeve 63, which is carried on axle 57. Tape 61is in constant engagement with sleeve 63, and sleeve 63 rotates to allowfor the change in orientation between tape 61 and box 43 as box 43 movesfrom between vertical and horizontal portions of tracks 45, 47 duringoperation of system 41. Tape 61 may be attached to sleeve 63 using anyappropriate means, such as mechanical fasteners, friction means, oradhesive means. An intermediate pulley 65 is mounted to sidewall 53 witha bracket 67, such that pulley 65 is positioned to support tape 61 alongthe tape path.

FIG. 5 shows a schematic view of the configuration of tracks 45, 47. Aslot 69 is formed in inner track 47 to allow for axle 57 and sleeve 63to pass through track 47, slot 69 having a width slightly larger thanthe diameter of sleeve 63. While it is preferable that slot 69 is formedin a horizontal portion of track 47, the location of slot 69 will bedetermined primarily by the relative spacing of wheels 49, 51 on box 43.

FIG. 6 is a schematic side view of a portion of another embodiment of aconveyor system. System 71 comprises a transport box 73, a pair of outerwheel tracks 75, and a pair of inner wheel tracks 77. For ease ofviewing, system 71 is shown with one track 75, 77 of each pair removed.Upper wheels 79 on each side of box 73 engage outer tracks 75, and lowerwheels on each side of box 73 engage inner tracks 77. Tracks 75, 77 areformed to have a similar configuration as those described above, andeach inner track 77 is formed to have a slot 83 for the axle (not shown)of one of upper wheels 79 to pass through. Each Inner track 77 also hasan additional dumping section 85 at the lower end of vertical section87, dumping section 85 comprising an angled portion that is not presenton outer tracks 75. Dumping sections 85 cause transport box 73 to movefrom a generally horizontal position, which is maintained throughout thetravel along the remainder of tracks 75, 77, into a dumping orientation,in which box 73 tilts to empty the contents onto surface 89. Duringoperation, if box 73 is moving downward toward surface 89, box 73 movesfrom position 1 to position 2 (shown in broken lines), and in each ofthese positions box 73 is maintained in a horizontal orientation.However, as lower wheels 81 encounter dumping sections 85 of tracks 77,box 73 moves to position 3, in which objects within box 73 may be dumpedonto surface 89. Box 73 is returned to a horizontal orientation byreversing the motion of box 73, so that lower wheels 81 move back intovertical sections 87. If dumping is not desired, box 73 may be stoppedin a position prior to lower wheels entering dumping sections 85.

FIG. 7 is a schematic view of an embodiment of a conveyor system inwhich the wheel tracks of a conveyor system 91 are formed as curves. Inthe preferred embodiment, the curves are horizontal planar curves,though additional embodiments may allow for helical curves or acombination of types of curves. Box 93 is carried by pairs of uppertracks and lower tracks (not shown), each pair comprising an outsidetrack and an inside track. In the top view shown, only the pair of uppertracks is visible, comprising inside upper track 95 and outside uppertrack 97. Inside upper track 95 comprises a first straight portion 95 a,a curved portion 95 b, and a second straight portion 95 c. Likewise,outer track 97 comprises a first straight portion 97 a, a curved portion97 b, and a second straight portion 97 c. The pairs of tracks 95, 97cooperate to guide box 93 along a curved travel path to the right (asbox 93 moves in the direction shown by arrow 98) while maintaining box93 in a selected angular orientation about horizontal axes passingthrough box 93.

To propel box 93 along its travel path, an inner tape 99 runs along atape path that generally coincides with inside track 95, the path beingdefined by pulleys 101 (only one labeled). In addition, an outer tape103 runs along a tape path that generally coincides with outside track97, the path being defined by pulleys 105 (only one labeled). Becausethe tape path of outer tape 103 through curved portion 97 b has agreater length than the tape path of inner tape 99 through curvedportion 95 b, a take-up loop 107 is formed to make the tape path ofinner tape 99 through curved portion 95 b equal to that of outer tape103 through curved portion 97 b. This ensures that correspondingportions of tapes 99, 103 simultaneously pass through the travel pathsin the pairs of straight portions 95 a, 97 a and 95 c, 97 c. To allowfor this, inner tape 99 disengages from box 93 as box 93 enters curvedportion 95 b, passes through the tape path and loop 107, and isreattached to box 93 at the other end of curved portion 95 b. As boxtravels through curved portion 95 b, box 93 is propelled only by tape103, which remains attached to box 93.

For example, FIG. 8 shows a schematic end view of a portion of conveyorsystem 91, the view being oriented so that the direction of travel shownby arrow 98 (FIG. 7) is into the page. An upper wheel 109 is carriedwithin inside upper track 95, and a pin 111 engages inner tape 99 byextending through a hole in tape 99. This allows the motion of tape 99to be transferred to box 93 when pin 111 is engaged with tape 99.

Referring also to FIG. 7, while box 93 is in section 95 a of track 95,tape 99 is located in position 1 of FIG. 8, wherein tape 99 is engagedwith pin 111. As box 93 enters curved section 95 b, tape 99 is moveddownward to disengage tape 99 from pin 111, which is shown as position2, and then tape 99 is rotated approximately 90 degrees in the directionshown by arrow 113 to position 3. This rotates tape 99 to a verticalorientation, and tape 99 is guided through the tape path by pulley 101,which rotates on a vertical axis 115. As box 93 moves from curvedsection 95 b to section 95 c, tape 99 is rotated back to a horizontalorientation (position 2) and then moved upward to re-engage pin 111(position 1).

Another embodiment of a conveyor system having curved wheel tracks isshown in the schematic views of FIGS. 9 through 12. As shown, conveyorsystem 117 is configured for making a right turn and a left turn, thoughsystem 117 can be configured with any number of right and left turns ora combination of any number of turns in either direction. Upper wheels121 and lower wheels 123 are located on each side of box 119, and wheels121, 123 engage pairs of upper tracks 125 and lower tracks 127,respectively. Two tapes 129, 131 are configured to propel box 119 alongthe travel path defined by tracks 125, 127, tapes 129, 131 being guidedby pulleys 133 having a generally horizontal axis of rotation and bypulleys 135 having a generally vertical axis of rotation. Box 119 isconfigured to turn right around curve 137 and left around curve 139 whentraveling in the direction shown by arrow 141. As with all embodimentsshown herein, the movement is reversible to move box in the oppositedirection along tracks 125, 127.

In order to illustrate the sequence of steps in manipulating tapes 129,131 during operation of system 117, the steps are illustrated usingposition numbers, with corresponding numbers appearing on each of FIGS.9 through 12. The sequence for turning right around curve 137 is shownfor positions 1 through 6, and the sequence for turning left aroundcurve 139 is shown for positions 7 through 12.

Position 1 is located prior to box 119 entering curve 137. As shown atthe top of FIG. 11, box 119 has an upper wheel 121 on each side of box119 and a generally vertical pin 143 located between box 119 and eachwheel 121. Each pin 143 is configured for engaging a hole in thecorresponding tape 129, 131 for transferring motion of tapes 129, 131 tobox 119. Tapes 129, 131 are in a generally horizontal orientation.

In position 2, tapes 129, 131 are lowered using horizontal pulleys 133to disengage tapes 129, 131 from their corresponding pins 143, and anangled roller 145 is used to begin turning tapes 129, 131 90 degrees toa generally vertical orientation. In curve 137, tape 129 is located onthe inside of the curve and engages an inner tape guide 147, which maybe a stationary track or a roller. Tape 131 engages a generallyhorizontal pin 149 attached to box 119 for propelling box 119 throughcurve 137. This configuration continues through positions 3, 4, and 5Because of the shorter path for tape 129 through curve 137, a take-uploop 151 is provided.

Between positions 5 and 6, angled rollers 145 begin to rotate tapes 129,131 back to a horizontal orientation, and tapes 129, 131 disengage fromguide 147 and pin 149. In position 6, tapes 129, 131 are moved upwardand re-engage pins 143 for propelling box 119.

The sequence of tape manipulations in curve 139 is the mirror image ofthose in curve 137.

Position 7 is located prior to box 119 entering curve 139. Each pin 143engages a hole in the corresponding tape 129, 131, which are in agenerally horizontal orientation.

In position 8, tapes 129, 131 are lowered using horizontal pulleys 133to disengage tapes 129, 131 from their corresponding pins 143, and anangled roller 145 is used to begin turning tapes 129, 131 to thegenerally vertical orientation. In curve 139, tape 131 is located on theinside of the curve and engages an inner tape guide 153, which may be astationary track or a roller. Tape 129 engages a generally horizontalpin 149 for propelling box 119 through curve 139. This configurationcontinues through positions 9, 10, and 11 Because of the shorter pathfor tape 131 through curve 139, a take-up loop 155 is provided.

Between positions 11 and 12, angled rollers 145 begin to rotate tapes129, 131 back to the horizontal orientation, and tapes 129, 131disengage from guide 153 and pin 149. In position 12, tapes 129, 131 aremoved upward and re-engage pins 143 for propelling box 119.

The conveyor system embodiments shown herein provide many advantages,including: 1) the ability to maintain a conveyor member in a selectedorientation throughout the travel path; 2) the ability to turn left orright; 3) high reliability; and 4) low cost.

It should be noted that each of the features shown in a describedembodiment may be combined with other appropriate features from otherembodiments. It should also be noted that the conveyor systems may beoperated in either direction or may be configured as a continuous loop.While pins for engaging tapes or belts are shown as stationary, pins mayalso be configured to be retractable or otherwise movable relative tothe conveyor member. For example, the pins may rotate or slide betweenpositions. It should be noted that “tape,” as used herein, is meant toencompass all appropriate types of flexible, belt-like components and isnot meant to be limiting.

While this description makes reference to illustrative embodiments, itis not intended to be construed in a limiting sense. Variousmodifications and other embodiments will be apparent to persons skilledin the art upon reference to the description.

1. A conveyor system, comprising: a pair of wheel tracks having portionsthat form a curved section; a conveyor member having a pair of wheelslocated on opposite sides of the member, each wheel engaging one of thewheel tracks; a pair of tapes located on opposite sides of the member;and a propelling means for propelling the tapes in a selected direction;wherein both tapes are connected to the member when the conveyor memberis not located in the curved section; and wherein a tape on an outsideof the curved section is connected to the member while the other tapepasses through a take-up loop.
 2. The conveyor system according to claim1, wherein the tapes are generally vertical through the curved section.3. The conveyor system according to claim 1, further comprising:generally vertical pins attached to the member; and at least onegenerally horizontal pin attached to the member; wherein the tapesengage the vertical pins when the member is not in the curved section,and one of the tapes engages the horizontal pin when the member islocated in the curved section.
 4. A method of propelling a conveyormember of a conveyor system, the method comprising: a) providing aconveyor member configured to be propelled along tracks; b) propelling apair of tapes located on opposite sides of the conveyor member; c)engaging a generally vertical pin with each tape when the member is in alinear portion of the tracks; and d) engaging a generally horizontal pinwith one of the tapes when the member is in a curved portion of thetracks.